I would really like to use lock in most of my activities (which I've figured out how to enable), but to my surprise, once locked the watch stops responding to up / down keys too so data screens can't be changed. I am used to a different behavior with another brand. It seems quite inconvent to have to constantly unlock the watch just to change data screens.
It would be really nice to have an option for that, e.g. whether lock applies to all keys or just action keys like lap, start/stop, etc.